Why Tonka?

Hi team.
Proberbly the most simple question of today. Why do some people refer to the Tornado as a “Tonka”????? I’ve heard them called
Panavia Panther
Multi Role Combat Aircraft
Must Refurbish Camberras Again
Mother Reilys Cardboard Aeroplane
Tornado
But only recently the Tonka. Why???
It is a sign of age but every time I hear of them being retired I still think, “but the MRCA has only just entered service”!!!!!!!

Rgds Cking